| |
Synthesis and CO2 Solubility Studies of Poly(ether carbonate)s and Poly(ether ester)s Produced by Step Growth Polymerization.
Poly(ether carbonate)s (PEC) and poly(ether ester)s (PEE) were synthesized by step growth polymn., and the reaction conditions were optimized. The soly. of the polymers in CO2 was then evaluated using two methods:(i) observation of the cloud point and (ii) gravimetric extn. Our results suggest that it is difficult to give an exact description of the soly. profiles for these polymers us...
http://www.polymer.cnt//ss/tanbien/publicationsshow_1559.html |
| |
Synthesis of Emulsion-Templated Poly(acrylamide) Using CO2-in-Water Emulsions and Poly(vinyl acetate)-Based Block Copolymer Surfactants.
We present here a simple and generic method for producing inexpensive and biodegradable polymer surfactants for use in supercrit. CO2. Low mol. wt. (Mw<7000 g/mol) hydroxyl-terminated poly(vinyl acetate) (PVAc-OH) was synthesized using optimized reaction conditions and iso-Pr ethanol (IPE) as the chain transfer agent. Oligomeric PVAc-OH (OVAc-OH, Mw<3000 g/mol) was then obtained ...
http://www.polymer.cnt//ss/tanbien/publicationsshow_1553.html |
| |
CO2-in-Water Emulsion-Templated Poly(vinyl alcohol) Hydrogels Using Poly(vinyl acetate)-Based Surfactants.
We present here a methodol. to produce highly porous cross-linked hydrogel materials by templating concd. CO2-in-water (C/W) emulsions. Poly(vinyl alc.) (PVA), blended PVA/PEG, and naturally derived chitosan materials were produced via this route. The technique can be carried out at moderate temps. and pressures (25, <120 bar) using inexpensive hydrocarbon surfactants such as PVAc-based b...
http://www.polymer.cnt//ss/tanbien/publicationsshow_1551.html |
| |
Methoxy Poly(ethylene glycol)-b-Poly(L-lactic acid) Copolymer Nanoparticles as Delivery Vehicles for Paclitaxel
Methoxy poly(ethylene glycol)-b-poly(l-lactic
acid) (MPELLA) was prepared by the melt polycondensation
of methoxy poly(ethylene glycol) and l-lactic acid.
The structure and properties of MPELLA were characterized
by IR, 1H-NMR, differential scanning calorimetry, and wideangle
X-ray diffraction. To estimate its feasibility as a vehicle
for paclitaxel, MPELLA nanoparticles were prepared by a
...
http://www.polymer.cnt//ss/dengliandong/publicationsshow_1388.html |
| |
Relaxation study of Poly(methylmethacrylate) in miscible blends with poly(ethylene oxide) by low-frequency anelastic spectroscopy
S. Y. Shang*, Z. P. Fang, Z. G. Zhu. Relaxation study of Poly(methylmethacrylate) in miscible blends with poly(ethylene oxide) by low-frequency anelastic spectroscopy, Physica B: Condensed Matter, 2009.5, 404(8-11): 1200-1203
http://www.polymer.cnt//ss/zpfang/publicationsshow_1167.html |
| |
“Alternative Block Polyurethanes Based on Poly(3-hydroxybutyrate-co-4-hydroxybutyrate) and Poly(ethylene glycol)” Biomaterials 2009, 30(16), 2975-2984.
A series of amphiphilic alternative block polyurethane copolymers based on poly(3-hydroxybutyrate-co-4-hydroxybutyrate) (P3/4HB) and poly(ethylene glycol) (PEG) were synthesized by a facile way of coupling reaction between P3/4HB-diol and PEG-diisocyanate, with different 3HB, 4HB, PEG compositions and segment lengths. Stannous octanoate was used as catalyst. The chemical structure, alter...
http://www.polymer.cnt//ss/xukaitian/publicationsshow_1145.html |
| |
In vitro and in vivo protein delivery from in situ forming poly(ethylene glycol)-poly(lactide) hydrogels
Previous studies have shown that stereocomplexed hydrogels are rapidly formed in situ by mixing aqueous solutions of eight-arm poly (ethylene glycol)-poly(L-lactide) and poly(ethylene glycol)-poly(D-lactide) star block copolymers (denoted as PEG-(PLLA)(8) and PEG(PDLA)(8), respectively). In this study, in vitro and in vivo protein release from stereocomplexed hydrogels was investigated. These hydr...
http://www.polymer.cnt//ss/zhongzhiyuan/publicationsshow_1006.html |
| |
Enzymatic degradation of poly(epsilon-caprolactone)/poly(DL-lactide) blends in phosphate buffer solution
Blend films of poly(epsilon-caprolactone) (PCL) and poly(DL-lactide) (PDLLA) with 0.5 weight fraction of PCL were prepared by means of solution casting and their degradation behavior was studied in phosphate buffer solution containing Pseudomonas (PS) lipase. Enzymatic degradation of the blend films occurred continuously within the first 6 days and finally stopped when the film weight loss reached...
http://www.polymer.cnt//ss/zhongzhiyuan/publicationsshow_977.html |
| |
Miscible binary blends of poly(ethylene oxide) and poly(ether sulfone)-Part 1: Crystallization kinetics, morphology and thermal-behaviour
G.Dreezen, Z.Fang, G.Groeninckx. Polymer, 1999, 40(21): 5907~5917
http://www.polymer.cnt//ss/zpfang/publicationsshow_773.html |
| |
Thermal behavior and intermolecular interactions in blends of poly(3-hydroxybutyrate) and maleated poly(3-hydroxybutyrate) with chitosan
The thermal behavior and intermolecular interactions of blends of poly(3-hydroxybutyrate) (PHB) and maleated PHB with chitosan were studied with differential scanning calorimetry, Fourier transform infrared (FTIR), wide-angle X-ray diffraction (WARD), and X-ray photoelectron spectroscopy (XPS). The differences in the two blend systems with respect to their thermal behavior and intermolecular inter...
http://www.polymer.cnt//ss/Zhouxuesong/publicationsshow_736.html |
| |